Did you make this instructable?

I believe that many of you have taken the question too litteral and I expect that the asker has used the term "Free Energy" in the sense of not having to pay in currency.

There are numerous ways of generating "Free Energy" depending on various factors such as your application needs, startup capital, efficiency requirements, etc.

The most common free energy sources are Solar and Wind powered generation, though these will surely require a large startup capital and be less efficient for powering a large scale application.

Jayefuu and lemonie gave the best answers sofar. seandogue's suggestion isn't bad as well, though it won't be sustainable enough in continuos applications that require a constant power source.

The most efficient way to generate power, I've seen sofar, is known as Induction Generation. The How-To can be found here: http://www.qsl.net/ns8o/Induction_Generator.html and http://www.arthropodsystems.com/AsynchronousGenerator1/AsynchronousGenerator1.html

Inducion Generation requires the least amount of startup capital and technical know-how and is definitely the most efficient, low maintenance way to generate "Free Energy".

I've tried and tested the system myself and found that I can easily generate enough power to run most appliances around the house, without the need for external "On-Grid" power. So much so, that I'm planning to make an affordable, commercialized version of my designs to be implemented in rural areas in my country.

All "Generators" are really just converters. They convert one form of energy to electricity. In this sense any generator needs something to convert from, and could be considered a "fuel". Any local source of energy can be converted, it's just a question of how efficiently you can do the conversion and is that energy reliable or not.

+1. I also sensed something funny about the semantics of this "fuelless generator" question. How to make a generator without fuel? Without a source of thermodynamically available input energy of some kind?

I've always considered it apt that "fuelless" sounds like "foolish". Not calling the querent foolish -- it's a reasonable question even if the answer is "you can't" -- but the folks who insist that they've found a way to create one are either fooling themselves or running a scam.

As others have noted, there are "free" energy sources (solar, wind, waves, geothermal...) but that isn't what's usually meant by fuelless.

Solar power is free - a Stirling engine can turn the heat into rotary motion to drive a generator. Methane digester for human - animal or vegetable waste round here they give horse manure away. Most Diesel engines will run on waste cooking oil if you can get a free supply. Wave power on a small scale should not be beyond a determined DIY engineer Wind power is well documented. Depending on your location and resources geothermal energy is a possibility. Live at the top of a hill? The going down is free!